Stapling machine



Oct. 30, 1934. H. J. BAUR V STAPLING MACHINE Filed April 16. 1932 2 Sheets-Sheet l f/zue/ My:

H. J. BAUR STAPLING MACHINE Oct. 30, 1934.

Filed April 16. 1952 2 Sheets-Sheet 2 Patented Oct. 30, 1934 UNITED STA PATENT OFFICE Application April 16,1932, Serial No. 605,607

3 Claims.

The principal object of this invention is to provide an improved stapling machine, in the nature of a small hand tool, which is designed to be both held and operated with'the same hand.

Another important object of the invention is to provide, in a staplingv machine of the spring driven hammer type, an improved hammer retracting and releasing mechanism.

Other more specific objects and advantages of the invention will be apparent to those skilled in the art upon a full understanding of the construction, arrangement and operation of the improved machine.

Three different stapling machines which 'possess'certain novel features in common are presented herein as illustrative embodiments of the invention, but it will of course be appreciated that the invention is susceptible of incorporation in other structurally modified forms coming equally within the comprehensive scope of the appended claims.

In the accompanying drawings:

Fig. 1 is a side view of a stapling machine which is constructed in accordance with the invention; j

Fig. 2 is a top view of the same machine;

' Fig. 3 is a side view of a different machine;

Fig. 4 is a side view of a still different machine; and I Fig. 5 is a top view of the machine shown in Fig. 4.

' The machine which is shown in Figs. 1 and 2 will first be described. This particular machine is adapted to be held in one hand and operated by the same hand to both drive and clinch a staple. It may obviously be used for a great many difierent purposes-one typical use being in places such as stores, stock rooms and factories for applying price or identification tags to garmentsor other articles made of thin material.

As will be observed in Fig. 1, the machine includes an'arm'lO which is provided at'its front end with a staple clinching die 11. The arm 10 is positioned beneath another arm 12, in forwardly diverging relation to the latter, and is cally in a guideway 17 in the front portion of the head and is provided at its lower end with a thin blade 18 which is adapted to operate in a closely conforming guideway 19 which is located in direct opposition to the staple clinching die 11 on the lower arm. The arm 12 contains a staple magazine 20, in the nature of a longitudinally extending guideway of U-shaped cross section, which opens at its front end into the guideway 19.

When the hammer 16 moves upwardly, the

lower edge of the blade 18 will clear the front end of the guideway 20 and the foremost staple in the latter will be fed forwardly into the guideway 19 by the action of a follower 21 in the guideway 20 which is advanced by a spring 22. When the hammer 16, after having been raised far enough to permit a staple to be fed into the guideway 1 9, is then moved downwardly, the staple in the guideway will be driven downwardly and clinched against the die 11, the die 11 at such time being pressed firmly against the front end of the arm 12 on the interposed sheets of material being stapled, by gripping means which will hereinafter be described.

' A spring 23 is positioned in the guideway 17 above the hammer l6 and is compressed between a socket 24 in the top of the hammer and a vertically adjustable plate 25 in the upper end of the guideway. The hammer 16 is raised against the compression of the spring 23 by depressing a handle 26 which is pivotally connected at its front end to the upper portion of the head 15- by a pin 27. The handle 26 is located a substantial distance above the arm 12 in rearwardly diverging relation to the latter and is coupled by a link 28 to the rear end of a small lever 29, which lever is pivotally mounted within the head 15 on a pin 30. A dog 31 is pivotally connected at its upper end to the front end of the lever 29 by a pin 32 and is urged forwardly with respect to the lever by a wire spring 33. The dog 31 is provided atits lower end with a hook 34 which is adapted to engage within a recess 35 in the rear face ofthe hammer 16.

When the handle 26 is pressed down, the dog 31 will be raised and will carry with it the hammer 16, against the yielding resistance of the spring 23. As the hammer 16 approaches its uppermost position, a stationary cross member 36 in the head will engage with an inclined surface 37 on the front portion of the dog and will cam the latter outwardly away from the hammer 16, thereby releasing the latter and permitting the same to drive the staple then in the guideway 19. When the pressure on the handle 26 isthereafter released, the latter will be returned to its initial position by the action of a small wire spring 38.

The lower arm 10 of the machine, which carries the staple-clinching die 11, is provided at its rear end with a laterally offset upwardly extending portion 39 which terminates in a laterally setback forwardly extending handle 40. The handle 40, which is of about the same effective length as the handle 26, is located directly above the arm 12, in generally parallel relation to the arm 10, between the arm 12 and the handle 26, in which position it forms with the latter a compressible two-part hand grip of convenient shape and size.

When the hand grip26-40 is squeezed, the arms 10 and 12 will move together into firmly clamped engagement with the material which hasbeen previously inserted between the front ends of the arms, after which the hammer 16 will be retracted against the resistance of the spring 23 and then immediately tripped, causing the staple to be driven through the material and clinched against the under surface of the latter. When the pressure on the hand grip 26--40 is released, the front ends of the arms 10 and 12'will spring apart again, after which the upper handle 26 will return to its initial position.

The proportioning of the spring resistances,

combined with the proportioning of the leverages operating against the same, is such as to insure the above described operating sequences. Before the handles 26 and 40 are forced toward each other they preferably are in generally parallel relation, and after they have been forced toward each other as far as they will go they preferably are again in generally parallel relation notwithstanding the fact that both handles oscillate in different directions about centers at opposite ends of the upper arm 12. Themaintenance of this generally parallelrelationship makes the machine very easy to operate.

The machine which is shown in Fig. 3 will drive a staple but will not clinch the same, and for that reason may be aptly termed a tacker. It may be used advantageously in applying address tags and the like to shipping cases or other flat surfaces. The machine has a fiat-bottomed base41 which is adapted to be pressed firmly against the surface into which the staple is to be driven. The base 41 is provided with a fixed handle 42 and with a movable handle 43, which movable handle op- The machine shown in Figs. 4 and 5 employs the same staple driving mechanism as the other first arm and is provided with a staple clinching .two machines but differs in the'arrangement of the handles and in the nature of the power transmitting linkage employed. This machine is provided at its upper end with a fixed rearwardly extending handle 45. A movable operating handle 46 is pivotally connected to the front end of the machine below the front end of the handle 45 by a pin 47 and is normally maintained in a rearwardly and downwardly inclined position by a wire spring 48. The handle 46 is connected by a curved downwardly extending link 49 to the front end of a short lever 50. The lever 50, which is located a substantial distance below the front end of the handle 46, is pivotally connected to the frame of the machine by a pin 51 and is provided at its front end with a hammer-engaging dog 52, which dog coacts with the downwardly springpressed hammer 53 in the same manner as the die and a handle, said handles being arranged in spaced relation to each other to' form together a hand grip which upon compression will first bring the arms together on'the material to be stapled and will then operate the staple driving mechanism without further movement of the arms.

2. In a stapling machine, the combination with an arm which is provided with a staple ,driving mechanism and a relativelymovable operating handle, of a second arm which is pivotally connected to the first arm and-is provided with a staple clinching die and a relatively stationary handle, said handles being arranged in spaced generally parallel relation to each other to form together a hand grip which upon compression will first bring the arms together on the material to be stapled and will then operate the staple driving mechanism without further movement of the arms.

3. In a stapling machine, the combination with an arm provided at its front end with a staple driving mechanism and a'rearwardly extending relatively movable operating handle, of a U-shaped member with one leg provided at its front end with a staple clinching die, said U-shaped member being pivotally connected at the. base of the U to the rear end of said first named arm, the other leg of said U-shaped member constituting a second handle locatedabove the first named arm, said two handles being arranged in spaced and generally parallel relation to each other to form together a hand grip to bring the arms together on the material to be stapled, andthen to operate the staple driving mechanism.

HUGO J. BAoR. 

